Optical filter with light transmittance dependency on incident a

Details Optical filter with light transmittance dependency on incident a Optical filter with light transmittance dependency on incident a

1994-11-15

1996-11-05

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

369112, 369116, 369118, G11B 7121

Patent

active

055725007

ABSTRACT:
An optical reproducing system has a first optical path from a light source to an optical disc, and a second optical path from the optical disc to a photodetector. An objective lens is provided in the first optical path for forming an a non-collimated beam applied to the optical disc. A profile conversion filter having an angle dependent transmittance characteristic is provided between the objective lens and the optical disc.

REFERENCES:
patent: 5072437 (1991-12-01), Chikuma
patent: 5121239 (1992-06-01), Post
patent: 5121378 (1992-06-01), Hirose et al.
patent: 5153873 (1992-10-01), Spruit et al.
patent: 5247510 (1993-09-01), Lee et al.
patent: 5434840 (1995-07-01), Ezuka et al.

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